# Copyright 2021 The Layout Parser team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from abc import ABC, abstractmethod
from enum import IntEnum

from ..file_utils import requires_backends

class BaseOCRElementType(IntEnum):
    @property
    @abstractmethod
    def attr_name(self):
        pass


class BaseOCRAgent(ABC):
    @property
    @abstractmethod
    def DEPENDENCIES(self):
        """DEPENDENCIES lists all necessary dependencies for the class."""
        pass

    def __new__(cls, *args, **kwargs):

        requires_backends(cls, cls.DEPENDENCIES)
        return super().__new__(cls)

    @abstractmethod
    def detect(self, image):
        pass
